Android 对话框支持自定义标题,内容,按钮和点击事件,基本上可以满足我们日常的使用。 但有时候我们想要修改对话框的文字,按钮颜色等,系统并没有提供对应的方法,正常情况下只能自定义布局。 接下来通过源码解析介绍几种修改 Dialog样式的方法。 H5 H+ z; i3 l# x- p5 a/ b
一、Dialog源码解析
% ]2 V/ U+ x+ M. I2 S. B+ h8 Q1.1 new AlertDialog.Builder(this).create()0 q& l, O- a$ @; `7 M- T
protected AlertDialog(@NonNull Context context, @StyleRes int themeResId) {
super(context, resolveDialogTheme(context, themeResId));
//创建AlertController,是Dialog布局相关代码
mAlert = new AlertController(getContext(), this, getWindow());
}
@NonNull
public AlertDialog create() {
// We can't use Dialog's 3-arg constructor with the createThemeContextWrapper param,
// so we always have to re-set the theme
final AlertDialog dialog = new AlertDialog(P.mContext, mTheme);
P.apply(dialog.mAlert);
dialog.setCancelable(P.mCancelable);
if (P.mCancelable) {
dialog.setCanceledOnTouchOutside(true);
}
dialog.setOnCancelListener(P.mOnCancelListener);
dialog.setOnDismissListener(P.mOnDismissListener);
if (P.mOnKeyListener != null) {
dialog.setOnKeyListener(P.mOnKeyListener);
}
return dialog;
}
public void apply(AlertController dialog) {
if (mCustomTitleView != null) {
dialog.setCustomTitle(mCustomTitleView);
} else {
if (mTitle != null) {
dialog.setTitle(mTitle);
}
if (mIcon != null) {
dialog.setIcon(mIcon);
}
if (mIconId != 0) {
dialog.setIcon(mIconId);
}
..........
- AlertDialog 构造函数中会创建 AlertController,用来控制对话框的布局
- P.apply(dialog.mAlert); 将用户自定义的配置赋值给 AlertController
: v* s1 {5 G5 k7 A7 a( l 1.2 AlertController: G5 I) t6 I! y* q/ U2 x
public AlertController(Context context, AppCompatDialog di, Window window) {
mContext = context;
mDialog = di;
mWindow = window;
mHandler = new ButtonHandler(di);
final TypedArray a = context.obtainStyledAttributes(null, R.styleable.AlertDialog,
R.attr.alertDialogStyle, 0);
mAlertDialogLayout = a.getResourceId(R.styleable.AlertDialog_android_layout, 0);
mButtonPanelSideLayout = a.getResourceId(R.styleable.AlertDialog_buttonPanelSideLayout, 0);
mListLayout = a.getResourceId(R.styleable.AlertDialog_listLayout, 0);
mMultiChoiceItemLayout = a.getResourceId(R.styleable.AlertDialog_multiChoiceItemLayout, 0);
mSingleChoiceItemLayout = a
.getResourceId(R.styleable.AlertDialog_singleChoiceItemLayout, 0);
mListItemLayout = a.getResourceId(R.styleable.AlertDialog_listItemLayout, 0);
mShowTitle = a.getBoolean(R.styleable.AlertDialog_showTitle, true);
mButtonIconDimen = a.getDimensionPixelSize(R.styleable.AlertDialog_buttonIconDimen, 0);
a.recycle();
/* We use a custom title so never request a window title */
di.supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
} R.attr.alertDialogStyle 是对话框的默认样式 G9 M1 x% p# ]
<item name="alertDialogStyle">@style/AlertDialog.AppCompat</item>
<style name="AlertDialog.AppCompat" parent="Base.AlertDialog.AppCompat"/>
<style name="Base.AlertDialog.AppCompat" parent="android:Widget">
<item name="android:layout">@layout/abc_alert_dialog_material</item>
<item name="listLayout">@layout/abc_select_dialog_material</item>
<item name="listItemLayout">@layout/select_dialog_item_material</item>
<item name="multiChoiceItemLayout">@layout/select_dialog_multichoice_material</item>
<item name="singleChoiceItemLayout">@layout/select_dialog_singlechoice_material</item>
<item name="buttonIconDimen">@dimen/abc_alert_dialog_button_dimen</item>
</style> 上述代码可以看出,abc_alert_dialog_material 就是dialog的默认布局。
9 W' [6 Z7 L5 h# E6 Z4 Z<androidx.appcompat.widget.AlertDialogLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/parentPanel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="start|left|top"
android:orientation="vertical">
<include layout="@layout/abc_alert_dialog_title_material"/>
<FrameLayout
android:id="@+id/contentPanel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="48dp">
<View android:id="@+id/scrollIndicatorUp"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_gravity="top"
android:background="?attr/colorControlHighlight"
android:visibility="gone"/>
<androidx.core.widget.NestedScrollView
android:id="@+id/scrollView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clipToPadding="false">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.widget.Space
android:id="@+id/textSpacerNoTitle"
android:layout_width="match_parent"
android:layout_height="@dimen/abc_dialog_padding_top_material"
android:visibility="gone"/>
<TextView
android:id="@android:id/message"
style="@style/TextAppearance.AppCompat.Subhead"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="?attr/dialogPreferredPadding"
android:paddingRight="?attr/dialogPreferredPadding"/>
<android.widget.Space
android:id="@+id/textSpacerNoButtons"
android:layout_width="match_parent"
android:layout_height="@dimen/abc_dialog_padding_top_material"
android:visibility="gone"/>
</LinearLayout>
</androidx.core.widget.NestedScrollView>
<View android:id="@+id/scrollIndicatorDown"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_gravity="bottom"
android:background="?attr/colorControlHighlight"
android:visibility="gone"/>
</FrameLayout>
<FrameLayout
android:id="@+id/customPanel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="48dp">
<FrameLayout
android:id="@+id/custom"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</FrameLayout>
<include layout="@layout/abc_alert_dialog_button_bar_material"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</androidx.appcompat.widget.AlertDialogLayout> 标题布局:) W0 s5 `; v! l. @ k, v8 y! o
<!-- abc_alert_dialog_title_material: -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/topPanel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<!-- If the client uses a customTitle, it will be added here. -->
<LinearLayout
android:id="@+id/title_template"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical|start|left"
android:orientation="horizontal"
android:paddingLeft="?attr/dialogPreferredPadding"
android:paddingRight="?attr/dialogPreferredPadding"
android:paddingTop="@dimen/abc_dialog_padding_top_material">
<ImageView
android:id="@android:id/icon"
android:layout_width="32dip"
android:layout_height="32dip"
android:layout_marginEnd="8dip"
android:layout_marginRight="8dip"
android:scaleType="fitCenter"
android:src="@null"/>
<androidx.appcompat.widget.DialogTitle
android:id="@+id/alertTitle"
style="?android:attr/windowTitleStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:ellipsize="end"
android:singleLine="true"
android:textAlignment="viewStart"/>
</LinearLayout>
<android.widget.Space
android:id="@+id/titleDividerNoCustom"
android:layout_width="match_parent"
android:layout_height="@dimen/abc_dialog_title_divider_material"
android:visibility="gone"/>
</LinearLayout> 按钮布局:7 j: v) Z2 M/ b6 z& U9 Z
<!-- abc_alert_dialog_button_bar_material: -->
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/buttonPanel"
style="?attr/buttonBarStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fillViewport="true"
android:scrollIndicators="top|bottom">
<androidx.appcompat.widget.ButtonBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="bottom"
android:layoutDirection="locale"
android:orientation="horizontal"
android:paddingBottom="4dp"
android:paddingLeft="12dp"
android:paddingRight="12dp"
android:paddingTop="4dp">
<Button
android:id="@android:id/button3"
style="?attr/buttonBarNeutralButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<android.widget.Space
android:id="@+id/spacer"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="1"
android:visibility="invisible"/>
<Button
android:id="@android:id/button2"
style="?attr/buttonBarNegativeButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@android:id/button1"
style="?attr/buttonBarPositiveButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</androidx.appcompat.widget.ButtonBarLayout>
</ScrollView> 二、修改Dialog样式
/ p4 s/ E* N: [1 ^9 v3 i( a3 B2.1 通过findViewById
% |1 H" d. o% L/ g4 e. l& tAlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(msg);
builder.setPositiveButton(getString(R.string.yes), null);
AlertDialog dialog = builder.create();
dialog.show();
//直接通过id找到对应的控件
Button button = dialog.findViewById(android.R.id.button1);
//或者通过getButton方法也可以获取到
Button button2 = dialog.getButton(DialogInterface.BUTTON_POSITIVE) 这种修改方式必须在 show() 之后调用,否则会出现空指针异常。这个是因为,执行 show() 方法的时候,dialog才会初始化布局,具体源码可以查看 Dialog 的 onCreate 方法。
7 n+ p& Z. r3 Z9 p. n0 Q1 \# T2.2 自定义style
* z5 m. l8 W3 ~ 通过上面源码可以发现,Dialog三个按钮的样式如下:5 ?; i3 {0 o. K4 ]4 ?
- buttonBarNeutralButtonStyle
- buttonBarNegativeButtonStyle
- buttonBarPositiveButtonStyle2 b; x4 N! `3 b, ]$ ^ p2 q
<Button
android:id="@android:id/button3"
style="?attr/buttonBarNeutralButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<android.widget.Space
android:id="@+id/spacer"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="1"
android:visibility="invisible"/>
<Button
android:id="@android:id/button2"
style="?attr/buttonBarNegativeButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@android:id/button1"
style="?attr/buttonBarPositiveButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/> 自定义样式替换上述 style即可达到修改效果。 N! n8 A* L$ G3 H% }' W. a9 x
在style.xml添加如下代码:
7 A% F/ A# E, \" ~8 H: ]( s: s- m& \<style name="accessPositiveBtnStyle" parent="Widget.AppCompat.Button.ButtonBar.AlertDialog">
<item name="android:textColor">@color/test1</item>
</style>
<style name="accessNegativeBtnStyle" parent="Widget.AppCompat.Button.ButtonBar.AlertDialog">
<item name="android:textColor">@color/test2</item>
</style>
<!-- 弹出框样式 -->
<style name="testDialogTheme" parent="Theme.AppCompat.Light.Dialog.Alert">
<item name="buttonBarPositiveButtonStyle">@style/accessPositiveBtnStyle</item>
<item name="buttonBarNegativeButtonStyle">@style/accessNegativeBtnStyle</item>
</style> 具体使用:
: u$ i% G6 x# a; S8 JAlertDialog.Builder builder = new AlertDialog.Builder(this, R.style.testDialogTheme);
builder.setMessage("Test");
builder.setCancelable(false);
builder.setPositiveButton("确认", null);
builder.setNegativeButton("取消", null);
Dialog dialog = builder.create();
dialog.show();
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